Year	billion cubic meters
1961	105
1962	105
1963	105
1964	105
1965	105
1966	105
1967	105
1968	105
1969	105
1970	105
1971	105
1972	105
1973	105
1974	105
1975	105
1976	105
1977	105
1978	105
1979	105
1980	105
1981	105
1982	105
1983	105
1984	105
1985	105
1986	105
1987	105
1988	105
1989	105
1990	105
1991	105
1992	105
1993	105
1994	105
1995	105
1996	105
1997	105
1998	105
1999	105
2000	105
2001	105
2002	105
2003	105
2004	105
2005	105
2006	105
2007	105
2008	105
2009	105
2010	105
2011	105
2012	105
2013	105
2014	105
2015	105
2016	105
2017	105
2018	105
2019	105
2020	105